Histatin
The histidine-rich peptides in human saliva that kill Candida and close wounds, trialled as a mouthrinse and never marketed
Histatins are made by the salivary glands and do two things no one expected of a mouth protein: they kill Candida, and they drive the wound closure that makes oral injuries heal faster than skin. Two human trials tested a synthetic fragment against gingivitis in the early 2000s, and nothing reached the market.
What is it?
Histatins were isolated from human parotid saliva in 1988 and named for the histidines that dominate them. Their first known job was antifungal: salivary histatins kill Candida albicans, and histatin 5 does it by binding a specific protein on the fungal cell rather than punching holes in membranes as most antimicrobial peptides do.
The second job was found by accident. A cell-culture model of wound closure identified histatins as the major wound-closure stimulating factor in human saliva — the reason oral wounds close faster than skin wounds. That finding has driven a decade of work on histatins as wound-healing agents, in the eye as much as the mouth.
The human trials are both dental and both small. In 106 healthy volunteers, gels containing 0.0625%, 0.125% or 0.375% of P-113 were self-applied twice daily for 29 days to one quadrant with no other oral hygiene; the trial measured safety and gingivitis development. A companion trial tested a P-113 mouthrinse in the same experimental gingivitis model.
The newer laboratory work is mostly engineering. Native histatin 5 disappears from whole saliva within about 90 minutes, so groups have shortened it or swapped single residues; the best fragments keep antifungal activity, including against a fluconazole-resistant strain, and survive at least 8 hours. Combined with light-activated antimicrobial therapy, histatins cleared polyene-resistant biofilms that neither treatment cleared alone.
Repair is the other half of the field, and it has moved into the eye and bone. Topical histatin-5 closed alkali burns on animal corneas within a day and left less scarring and fewer new vessels; histatin-1 in a slow-release gel tripled vessel density and more than doubled new bone in rat defects, and it pushed dental pulp cells toward making dentine.
As a measurement, histatins track oral and systemic disease. A systematic review found salivary histatin-5 consistently lower with worse dental caries, histatin-3 was roughly doubled in early keratoconus corneas, and serum levels were lower in COVID-19 without pneumonia. Histatins remain in the saliva of everyone reading this and in no product. They survive in the acquired enamel pellicle, the protein film on teeth, which is where their antifungal work is presumed to happen. Nothing is approved, and the peptides are sold only as research material.
Mechanism of Action
Histatins are histidine-rich peptides in human saliva; histatin 5 kills Candida by binding a fungal cell protein rather than punching holes in membranes, and histatin 1 drives wound closure.
Antifungal
Histatin 5 binds a specific protein on Candida albicans and disrupts biofilm matrix.
Wound closure
Histatins are the main wound-closure factor in saliva, and histatin-1 acts through VEGFR2 in repair models.
Enamel and caries
They persist in the film on teeth, and lower salivary histatin-5 tracks worse dental caries.
Published Research
These are the studies that describe histatins, read from their PubMed abstracts: two trials in volunteers, the wound-closure finding and the antifungal mechanism.
P-113 gel against gingivitis
106 healthy volunteers brought to gingival health were randomised to placebo or 0.0625%, 0.125% or 0.375% P-113 gel, self-applied twice daily for 29 days to one quadrant with all other oral hygiene withheld there. Safety, toxicity and the development of gingivitis were the endpoints.
The mouthrinse version
In experimental gingivitis, a 0.01% P-113 (histatin-derived) mouthrinse significantly reduced plaque (P = 0.046) with a trend for gingivitis (P = 0.086) and no treatment-related adverse events.
Serum levels in COVID-19
In a cross-sectional study, histatin-3 and histatin-5 were lower in COVID-19 without pneumonia, while levels were preserved in severe pneumonia patients on corticosteroids; histatin-3 correlated with ferritin, D-dimer and albumin.
Keratoconus corneas
In corneal epithelial cells from patients with keratoconus, histatin-3 was roughly doubled in early stages while histatin-1 and -5 did not change; epithelial thickness rose with stage.
Why saliva closes wounds
Using a cell-culture model of wound closure, histatins were identified as the major wound-closure stimulating factors in human saliva. This is the finding that moved histatin research out of dentistry and into wound healing.
How they kill Candida
Salivary histatins are candidacidal, and this study identified a histatin 5-binding protein on the Candida cell. The mechanism is receptor-like binding rather than the membrane disruption most antimicrobial peptides use.
Saliva in severe dental caries
A systematic review found salivary histatin-5 consistently depleted and beta-defensin 2 raised with caries severity, though heterogeneity was high and certainty low for other antimicrobial peptides.
From oral health to therapeutics
A review describes how histatins are cleaved into fragments with roles in wound healing, enamel maintenance and oral microbiome balance, and surveys their potential as biomarkers and treatments.
Corneal burns in vivo
Topical histatin-5 after alkali injury cut the remaining corneal defect by about 60% at 18 hours and closed it by 24, with clearer corneas and less new vessel growth and immune cell infiltration by day 14.
Bone regeneration in rats
Histatin-1 in a sustained-release hydrogel raised the bone volume fraction in rat defects from 8.2% to 20.0% and tripled vessel density.
Dental pulp differentiation
Histatin-1 raised markers of odontoblast differentiation in dental pulp and apical papilla tissue and promoted mineralisation and cell migration through VEGFR2.
Shorter, tougher fragments
Shortened histatin-5 fragments kept antifungal activity, including against a fluconazole-resistant strain, and survived in whole saliva for at least 8 hours while the full peptide disappeared within 1.5.
Engineering stability
Substituting lysine residues in histatin-5 improved resistance to fungal proteases; one variant kept more activity after saliva exposure and prevented biofilm better than the natural peptide.
With light therapy against resistant biofilms
Histatin-3 and histatin-5 combined with antimicrobial photodynamic therapy reduced polyene-resistant multispecies biofilms more than either alone, while remaining biocompatible.
Breaking up biofilm matrix
Histatin-3 and histatin-5 reduced Candida albicans and Streptococcus mutans biofilm cells by 46% and 41% and degraded the matrix, without harming gingival fibroblasts.
Against the Chagas parasite
Histatin-5 reduced Trypanosoma cruzi viability with limited toxicity to mammalian cells, causing structural damage, apoptosis-like death and oxidative stress.
Dosing Data
No histatin product exists. The two human trials used gels and mouthrinses of P-113, a 12-amino-acid histatin fragment.
Educational information, not medical advice. Each dose above is tagged with its source: an approved label, a published human study, animal data, or amounts reported by users. None is a recommendation for you. An unapproved compound has no established safe or effective human dose, and products sold for “research use only” are not made or tested for people. Talk to a doctor before acting on anything on this site, including before you start, stop or change any medicine or dose. Full medical disclaimer.
Side Effects & Contraindications
Reported Side Effects
Little is published: the two human trials were short and in healthy volunteers.
Contraindications & Cautions
A research peptide with no approved product anywhere.
Legal Status
No histatin product is approved anywhere.
Frequently Asked Questions
?What are histatins?
A family of histidine-rich peptides made by the salivary glands. Histatins 1, 3 and 5 are the main ones, and they are present in everyone's saliva.
?What do they do?
Two things: they kill Candida albicans, and they are the main reason saliva drives wound closure, which is why mouth wounds heal faster than skin wounds.
?Have they been tested in people?
Twice, both in dentistry: a P-113 gel and a histatin mouthrinse, each in an experimental gingivitis model in volunteers, around 2001 and 2002.
?Can I buy a histatin product?
Not a medicine. Nothing is approved anywhere, and the trials that got closest were small dental studies over twenty years ago.
?Why do engineered histatin fragments matter?
Native histatin 5 disappears from whole saliva within about 90 minutes. Shortened fragments and single-residue variants keep antifungal activity, including against a fluconazole-resistant strain, and survive 8 hours or more.
?Are histatins used for wound healing?
Not in people yet. In animals, topical histatin-5 closed corneal alkali burns within a day and histatin-1 in a slow-release gel more than doubled new bone in rat defects.
References
- [pubmed] Paquette DW, et al. "Safety and clinical effects of topical histatin gels in humans with experimental gingivitis." J Clin Periodontol, 2002;29(12):1051-8. PMID: 12492903.
- [pubmed] Mickels N, et al. "Clinical and microbial evaluation of a histatin-containing mouthrinse in humans with experimental gingivitis." J Clin Periodontol, 2001;28(5):404-10. PMID: 11350502.
- [pubmed] Oudhoff MJ, et al. "Histatins are the major wound-closure stimulating factors in human saliva as identified in a cell culture assay." FASEB J, 2008;22(11):3805-12. PMID: 18650243.
- [pubmed] Edgerton M, et al. "Candidacidal activity of salivary histatins. Identification of a histatin 5-binding protein on Candida albicans." J Biol Chem, 1998;273(32):20438-47. PMID: 9685398.
- [pubmed] Oppenheim FG, et al. "Histatins, a novel family of histidine-rich proteins in human parotid secretion. Isolation, characterization, primary structure, and fungistatic effects on Candida albicans." J Biol Chem, 1988;263(16):7472-7. PMID: 3286634.
- [pubmed] Lei X, et al. "The cyclization of human salivary Histatin 1 via click chemistry for skin wound healing." Eur J Pharm Sci, 2025;204:106978. PMID: 39631632.
- [other] US FDA, Drugs@FDA (openFDA): no application for histatin or P-113. Read September 30, 2026.
- [pubmed] Muruganandhan J, et al. "Salivary antimicrobial peptides histatin-5, beta defensins, human neutrophilic peptides, LL-37, and calprotectin in severe dental caries, with a focus on early childhood caries: a systematic review and meta-analysis." Odontology, 2026. PMID: 42295538.
- [pubmed] Aydın U, et al. "Serum Histatin Levels in COVID-19: Association With Disease Severity and Immune Status." J Med Virol, 2026;98(6):e71009. PMID: 42267407.
- [pubmed] Demirkiran C, et al. "Investigation of histatin-1, histatin-3, and histatin-5 peptide levels in corneal epithelial cells obtained from patients with keratoconus." Eur J Ophthalmol, 2026;36(3):631-641. PMID: 41385247.
- [pubmed] Usman S, et al. "Exploring the Healing Powers of Histatins: From Oral Health to Therapeutics." Int J Mol Sci, 2025;26(11). PMID: 40507844.
- [pubmed] Son KN, et al. "Histatin-5 Improves In Vivo Corneal Wound Healing and Immunohistochemical Neovascular Markers After Acute Alkali Injury." Transl Vis Sci Technol, 2026;15(2):20. PMID: 41700792.
- [pubmed] Zhu Y, et al. "Histatin-1 promotes bone regeneration by coordinating osteogenic and angiogenic responses in a sustained-release hydrogel system." Biomater Adv, 2026;180:214618. PMID: 41289946.
- [pubmed] Silva P, et al. "Histatin-1 promotes the expression of markers associated with odontoblastic differentiation in the dental pulp and apical papilla." Sci Rep, 2026;16(1). PMID: 41644616.
- [pubmed] Zambom CR, et al. "Reducing Functional Domain of Histatin 5 Improves Antifungal Activity and Prevents Proteolytic Degradation." Microorganisms, 2025;13(5). PMID: 40431266.
- [pubmed] Makambi WK, et al. "Optimizing Histatin 5: Effects of K13 and K17 Substitutions on Proteolytic Stability and Antifungal Activity." Comput Struct Biotechnol J, 2026;35(1):0159. PMID: 42454103.
- [pubmed] Dias LM, et al. "Histatin-Photodynamic Therapy for Polyene-Resistant Biofilms in a 3D Model." J Dent Res, 2026;105(8):1089-1098. PMID: 41413929.
- [pubmed] Dias LM, et al. "Unlocking Histatin Potential against Candida albicans and Streptococcus mutans Biofilms: Targeting the Extracellular Matrix While Preserving Oral Cell Integrity." ACS Omega, 2025;10(25):27011-27022. PMID: 40621003.
- [pubmed] Blancas-Luciano BE, et al. "Human Histatin 5 Exerts Anti-Trypanosomal Activity Against Trypanosoma cruzi and Induces Ultrastructural Damage, Apoptosis-like Cell Death, and Oxidative/Nitrosative Stress." Int J Mol Sci, 2026;27(16). PMID: 42653366.
Sources & Citations
Studies were read from their PubMed abstracts. Read October 7, 2026.
Medical Disclaimer: This content is for educational and informational purposes only. It is not medical advice, and nothing here is an instruction to obtain or use any compound. Talk to a licensed clinician about your own situation.